package com.success.toutiao;

import java.util.List;

/**
 * Desc:
 * Create by John Jiang On 2018/12/19
 */
public class DLRIterrator {

    static class TreeNode {
        int val;
        TreeNode left;
        TreeNode right;
    }

    static class Recursive {

        List<TreeNode> list;

        public Recursive(TreeNode root) {

        }

        private void helper(TreeNode root) {

        }

    }

}
